ὄμφαξ (omphax)

an unripe grape , πάροιθε δέ τ᾽ ὄμφακές εἰσιν (Odyssey by Homer); ὅτ᾽ ὄμφακες αἰόλλονται (Hesiod); ὅταν δὲ τεύχῃ Ζεὺς ἀπp ὄμφακος οἶνον, i. e. autumn, when the unripe grapes become fit to make wine, (Aeschulus Tragicus) (ML)